Cannot connect to Deluge running on locahost, but will connect to its private IP address

Sonarr version (exact version): 2.0.0.5163
Mono version (if Sonarr is not running on Windows): 5.10.0.179
OS: Arch Linux aarch64 (Odroid C2)
Debug logs:
https://pastebin.com/QCQX47AK
Description of issue:
Sonarr seems to have a problem connecting to Deluge on 127.0.0.1 and localhost after it has been running a while. I changed the IP to 192.168.1.45 and it worked. I traced the deluge-web log and the connection never seems to be made until I correct the IP address.

This could be something in my setup but I wonder if it’s a Mono issue. I have seen this several times before but this is the first time I tried changing the IP to the private address. I am seeing the identical behavior in Radarr at this very moment. I just changed the IP there too.

I have also restarted deluged.service and deluge-web.service and the behavior persists. I expect if I were to restart sonarr and radarr the errors would go away as they have before.

This morning, I changed the IP back to localhost and Sonarr didn’t complain. I didn’t do anything but leave the machine alone all evening. I did my usual round of updates and rebooted it this morning. Stay tuned for further progress.

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